What Is a Deck Beam Called? Unlocking the Secrets of Deck Framing Terminology

Understanding Deck Beams: A Comprehensive Guide

Deck Beam Span Chart (2026): Maximum Spans, Post Spacing & Framing Rules
Deck Beam Span Chart (2026): Maximum Spans, Post Spacing & Framing Rules

When discussing the structural components of a deck, you might hear the term "deck beam" thrown around. But what exactly is a deck beam, and what are some of its common names? Let's delve into the world of deck construction and explore the various terms used to describe these crucial elements.

the parts of a deck and how to install them in order to make it look like an outdoor space
the parts of a deck and how to install them in order to make it look like an outdoor space

What is a Deck Beam?

A deck beam, also known as a joist header, is a horizontal structural member that supports the joists (or floor joists) of a deck. It runs perpendicular to the joists and transfers the weight and load of the deck to the supporting posts or columns. In essence, deck beams play a vital role in distributing the weight of the deck evenly, ensuring its stability and longevity.

a table with numbers and times for students to learn how to use the math skills
a table with numbers and times for students to learn how to use the math skills

Common Names for Deck Beams

Deck beams go by various names, depending on the region, the specific application, or the preference of the builder. Here are some of the most common terms used to describe deck beams:

1.9M views · 19K reactions | Deck joist span explained 💪 This is an in depth explanation of a deck and its components. I discuss joist span, beam span, deck ledgers and reading span charts. This is aimed to help You understand the basics of a deck and how builders make calculations before turning in plans 👍 | BAS Renovations | Facebook
1.9M views · 19K reactions | Deck joist span explained 💪 This is an in depth explanation of a deck and its components. I discuss joist span, beam span, deck ledgers and reading span charts. This is aimed to help You understand the basics of a deck and how builders make calculations before turning in plans 👍 | BAS Renovations | Facebook
  • Joist Header: As mentioned earlier, this term is often used interchangeably with deck beam. It refers to the beam that supports the joists and transfers their load to the supporting posts.
  • Band Board: In some regions, particularly the southern United States, deck beams are referred to as band boards. This term is more commonly associated with porch construction but can also be used to describe deck beams.
  • Beam: In its simplest form, a deck beam is often just referred to as a beam. This term is used to describe any horizontal structural member that supports weight and load.
  • Header: Similar to the joist header, the term header is used to describe the beam that supports the joists and distributes their load.
  • Ribbon Board: This term is less common but can be used to describe a deck beam, particularly in older construction or regional dialects.

Deck Beam Materials

Deck beams can be constructed from various materials, with the most common being pressure-treated lumber, composite materials, and steel. The choice of material depends on factors such as budget, desired lifespan, and local building codes.

Deck Beam & Header Span Table | Decks.com
Deck Beam & Header Span Table | Decks.com

Pressure-Treated Lumber

Pressure-treated lumber is the most common material used for deck beams due to its affordability and wide availability. It is treated with preservatives to resist rot, decay, and insect damage, making it a durable choice for outdoor applications.

Composite Materials

an image of the measurements for wooden beams
an image of the measurements for wooden beams

Composite deck beams are made from a combination of plastic and wood fibers, creating a low-maintenance, durable, and eco-friendly option. They are resistant to rot, decay, and insect damage, making them a popular choice for modern deck construction.

Steel

an image of the inside of a building with wood beams and text that reads 7 things you should do when building your deck
an image of the inside of a building with wood beams and text that reads 7 things you should do when building your deck
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Deck Building - Setting beam height for your deck building project
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Deck Beam Flashing
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How to Frame a Grade-Level Deck
Good - A diagram illustrating correct and incorrect methods of connecting a deck beam to a supporting post in deck framing. It focuses on post-to-beam connections. Key Features: * Title: \
Good - A diagram illustrating correct and incorrect methods of connecting a deck beam to a supporting post in deck framing. It focuses on post-to-beam connections. Key Features: * Title: \
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Post-to-Beam Connection Double-Board Beam
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How Close Should Deck Footings be to the House
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Installing a Deck Beam Directly on a Concrete Footing
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Top 5 Deck-Building Tips - Fine Homebuilding
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Deck Codes and Standards for the Best Backyard Deck Builders - Deck Construction
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Deck Beam Spacing: A Practical Construction Guide
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Expert Tips for How to Build a Deck
an ad for building code college with the words side - bolted deck beams code
an ad for building code college with the words side - bolted deck beams code
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the parts of a deck and how they are used to build it in your home
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What You Need to Know to Build a Raised Deck
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Great Deck Design Ideas & Planning Tips | DecksGo
the parts of a wooden deck and how to use it for building an outdoor dining table
the parts of a wooden deck and how to use it for building an outdoor dining table
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Single Span Raised Deck
Sistering Deck Joists
Sistering Deck Joists

Steel deck beams are often used in commercial or large-scale residential projects due to their exceptional strength and durability. They are more expensive than lumber or composite materials but offer a longer lifespan and require minimal maintenance.

Deck Beam Sizes and Spacing

The size and spacing of deck beams depend on the size and load of the deck, as well as local building codes. Generally, deck beams range in size from 2x8 to 2x12, with larger beams used for longer spans or heavier loads. Beams are typically spaced 16 or 24 inches on center, depending on the size of the beam and the load it must support.

Installing Deck Beams

Installing deck beams involves several steps, including calculating the load, selecting the appropriate beam size and material, and properly supporting the beams with posts or columns. It's essential to follow local building codes and consult with a structural engineer if you're unsure about any aspect of the installation process.

Maintaining Deck Beams

Proper maintenance is crucial for ensuring the longevity and safety of deck beams. Regular inspections can help identify any signs of damage, such as rot, decay, or insect damage. Prompt repairs and routine cleaning can help extend the lifespan of deck beams and prevent costly replacements.

Conclusion

Deck beams, also known as joist headers, play a critical role in the structural integrity of a deck. Understanding the various terms used to describe these essential components and the factors that influence their selection and installation can help homeowners make informed decisions about their deck construction or renovation projects. Always consult with a professional or a structural engineer when planning or building a deck to ensure it is safe, stable, and compliant with local building codes.